Burglar-alarm.



110,893,490. 7 PATENTED JULY 14, 1908. L. B. HANCOCK & w. J. STERLING.

BURGLAR ALARM.

APPLICATION FILED MAY 16,1906.

INVENTORS WITNESSES 15 Zea B. Jfizncoefll 1 ATTORNEYS UNITED STATESPATENT OFFICE.

LEE B. HANCOCK, OF BICHMOND, AND WILLIAM JACKSON STERLING, OFPORTSMOUTH, VIRGINIA.

BURGLAR-ALARM.

To all whom it may concern:

Be it known that we, LEE B. HANCOCK, of Richmond, county of Henrico,State of Virginia, and W'ILLIAM JACKSON STERLING, of Portsmouth, countyof Norfolk, and State of Virginia, citizens of the United States, haveinvented certain new and useful Improvements in Burglar-Alarms, of whichthe following is a specification.

This invention is an improvement in burglar alarms, and especially inthat class of burglar alarms having a cartridge holder, and a hammer forexploding the same when a window or other closure is opened; and theinvention consists in certain novel constructions and combinations ofparts as will be hereinafter described and claimed.

In the drawing Figure 1 is a side view of our invention as in use on awindow frame. Fig. 2 is a detail perspective view from the under side ofthe alarm illustrated in Fig. 1. Fig. 3 is a detail perspective view ofthe trigger.

By our invention we provide an alarm of the character referred to havinga main frame composed of a plate of metal bent to form a cartridgeholder, a flange whereby the frame may be secured to a-suitable supportand having a guide in which the hammer operates together with a springfor actuating the hammer, and a trigger for holding and releasing thehammer.

Referring to the construction shown in Figs. 1, 2 and 3 it will benoticed that the main frame A has a back plate A extended and bent at Ato form a cartridge holder and also bent at its upright edge to providea flange A for connection with a window frame B or other suitablestructure, and a plate A is bent from the back plate A at a rightangleto the flange A and is slotted longitudinally at A to form a guide forthe hammer C. This hammer C is pivoted at C to the back plate A and isactuated by the spring D secured at one end at D to the back plate andat its other end at D to the hammer C, and this hammer C projectsthrough the guide slot A has a head or portion C to strike thecartridge, and is provided on its opposite or back edge with a slot Copening toward the pivot C and extending approximately in the directionof length of the hammer, and adapted to receive one of the forwardlyprojecting lugs Specification of Letters Patent.

Application fi1ed May 16, 1906.

Patented July 14, 1908.

Serial No. 317,195.

E on the arms E of a T shaped trigger E which is pivoted at E so it maybe swung to either side to bring either of its forwardly projecting lugsE into the slot C to hold the hammer as will be understood from Figs. 1and 2.

In the construction shown in Fig. 1 the alarm is secured by screwspassing through of a staple, see Fig. 1, whose prongs F may be driveninto the window sash in such manner as to secure the cam projection F atthe desired angle. In the operation of this construction should any oneraise the window sash the cam projection F will operate upon the triggerto free the same from engagement with the hammer, and permit the latterto be actuated by the spring D to explode the cartridge.

We claim The alarm herein described consisting of the main frame havinga back plate provided with an extension bent to form a cartridge holderand having at one edge a flange at a rightangle to the plane of the backplate and adapted for connection with a suitable sup- Eort and providedat an angle with said ange with a wing in a plane at approximately arightangle to the plane of the back plate and extending between thecartridge holder and the said first flange, the said wing having alongitudinal slot forming a guide for the hammer throughout the lengthof the stroke of the latter, a spring actuated hammer pivoted to theback plate and projecting through the guide slot in the wing and havinga head portion to engage a cartridge in the cartridge holder, and atrigger for holding the hammer, substantially as set forth.

LEE B. HANCOCK.

WILLIAM JACKSON STERLING.

Witnesses to signature of Lee B. Hancock:

C. A. COLE. C. E. FLEMING.

Witnesses to signature of .William Jackson Sterling:

C. J. CoLLINs,

A. S. J. GAMMoN.

